div.my-overlay
{
    opacity: 0.5;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
    filter: alpha(opacity=50);
    -moz-opacity: 0.5;
    -khtml-opacity: 0.5;
    background: #aaaaaa;
    width: 100%;
    height: 100%;
    z-index: 10;
    top: 0;
    left: 0;
    position: fixed;
}

div.my-waiting
{
    display: none;
    opacity: 0.5;
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=50)";
    filter: alpha(opacity=50);
    -moz-opacity: 0.5;
    -khtml-opacity: 0.5;
    background: #aaaaaa;
    width: 100%;
    height: 100%;
    z-index: 10;
    top: 0;
    left: 0;
    position: fixed;
    background-image: url('../images/loading.gif');
    background-repeat: no-repeat;
    background-position: center center;
}

.dialog_target 
{
    width: 100%;
    height: 100%;
    z-index: 10;
    top: 0;
    left: 0;
    position: fixed;    
    background-image: url('../images/bg.png');
}